Having a little trouble picturing how you'd set up the Hi-Lo Controller? Here's a graphic that depicts a typical configuration where the Hi-Lo controls a solenoid on the RODI feedwater tube.

You can find our solenoids here:
http://www.buckeyefieldsupply.com/sh...owspecials=508
The 24V solenoids can be powered by any of the transformers on this page:
http://www.buckeyefieldsupply.com/sh...ry=503&Sub=151



Russ